It's mostly an "any race" class. Dwarf (for added defenses, which corruptors are a little low on, not that it matters much) or shalore would be my primary picks, though. Undead work well enough as well, for the same reason as dwarves do. Shalore's 10% crit racial is particularly good on them, though, as corruptors naturally lean toward a crit build later in the game. The global proc doesn't hurt either, though you probably won't be pumping dex to really benefit from it.
Stats wise, you max magic, get willpower to maybe 20-30 (vim regen on kill is boosted by willpower), then split between con and cun, leaning toward cunning. Maybe get enough strength together to wear platemail if you're feeling frisky -- vim is one of the few resources completely uneffected by fatigue. The particularly sexy late game armors for blast-casters are both robes, though (black robe and firewalker, iirc. They've got trigger-on-spell abilities.).
Talent wise, they're not very complicated. You don't have many generic talents, and of the curses and hexes, pacification and domination, and death and vulnerability are the particularly good ones. Domination can be left alone if you feel like it, but pacification is
incredible (especially maxed), vulnerability is one of your relative few native methods of resistance reduction, and the curse of death is just g'damn painful (not to mention buggers up healing).
Class wise, you mainly just throw points into junk that does damage, especially the direct AoE stuff. You can go into diseases or not, as you please, with a similar lean toward bone (though bone shield is somewhat useful in the later game -- though only against certain enemies -- and spear and nova gives some alright damage diversity from your normal blight/acid kit) being up to you. The fearscape tree is another up in the air thing... it can bring some amazing tools to your table (especially if you're a skeleton and can properly abuse wraithform), but its really good stuff (flames of U-whatever and fearscape) are very expensive. Willful tormenter helps out a bit with that, nowadays. Regardless, it's usually better saved for your 20 or 30 cat point.
Mostly you just stack on the pain and pick up the few defensive-type talents you can manage when the opportunity presents itself. Corruptors are largely all-dakka all the time, heh. 'Bout to turn in for the night, but I can probably write up a bit better point-by-point sometime tomorrow, when I'm more aware and hopefully using a proper keyboard. If someone doesn't ninja me to it